"Discover and apply hydraulic power with this multi-axis robotic arm. Water is all that's needed to make it move. Includes all parts needed to make the Mega Hydraulic Arm Robot and detailed instructions. Recommended for 8 years and up. Discover and apply hydraulic power with this multi-axis robotic arm. Water is all that's needed to make it move. Includes all parts needed to make the Mega Hydraulic Arm Robot and detailed instructions. A fun and impressive KidzLab science kit. Recommended for 8 years and up."